Survivability is the predominant major criteria for any fibre optical link during failure condition since it occurs frequently to disconnect several wavelength channels in the NG-PON2 system. The article proposes resilience in the protection mechanism for NG-PON2 network recommended by ITU-T G. 983.1 using Markov chain model. We analysed average downstream data loss for a 7:1 stacked NG-PON2 architecture where seven working lines can be protected by one protection line. The protection scheme allows protection to an architecture capable of a network throughput of 80 Gbps. Further, there is a comparison between the performance of 3:1 and 7:1 architecture for 40 and 80 Gbps data rate. © 2021, Springer Nature Singapore Pte Ltd.